Small number with satisfactory hideaway (4)
I believe the answer is:
nook
'hideaway' is the definition.
(thesaurus)
'small number with satisfactory' is the wordplay.
'small number' becomes 'no' (abbreviation for 'number').
'with' is a charade indicator (letters next to each other).
'satisfactory' becomes 'ok' ('ok' can be similar in meaning to 'satisfactory').
'no'+'ok'='NOOK'
(Other definitions for nook that I've seen before include "Secluded corner" , "Sheltered and secluded place" , "shady retreat" , "Cubbyhole" , "Interior angle formed where two walls meet" .)